Proper Filtering with Recursive Imports

[RayBenefield]

PR #11 introduced recursive imports however does not properly handle filtering at the import level for deep imports.

|- index.js
|- dir
    |- a.js
    |- c.js
    |- nested
        |- d.js
        |- b.js

The following should be possible:

import { A, Nested } from './dir/*';

console.log(A()); // Whatever is in './a.js'
console.log(Nested.D()); // Whatever is in './nested/d.js'
console.log(Nested.B()); // Whatever is in './nested/b.js'